| SPECIAL FEATURES | USED ON GMC ENGINE;MDL 1963-83;SERIES 153,194,230,250,283,292,307,327,350,400 |
| STEM DIAMETER | 0.3445 INCHES MINIMUM AND 0.3452 INCHES MAXIMUM |
| STEM LENGTH | 4.7810 INCHES MINIMUM AND 4.7910 INCHES MAXIMUM |
| STEM STYLE | DOUBLE GROOVED |
| DISTANCE FROM FIRST GROOVE TO STEM END | 0.3840 INCHES MINIMUM AND 0.3940 INCHES MAXIMUM |
| DISTANCE FROM SECOND GROOVE TO STEM END | 0.6290 INCHES MINIMUM AND 0.6390 INCHES MAXIMUM |
| CARBON RELIEF GROOVE | NOT INCLUDED |
| CHAMFER ANGLE IN DEG | 15.0 |
| CHAMFER LENGTH | 0.0060 INCHES NOMINAL |
| FIRST GROOVE DIAMETER | 0.2970 INCHES MINIMUM AND 0.3030 INCHES MAXIMUM |
| FIRST GROOVE WIDTH | 0.0950 INCHES MINIMUM AND 0.1050 INCHES MAXIMUM |
| FSC APPLICATION DATA | GASOLINE ENGINE |
| HEAD HEIGHT | 0.1860 INCHES MINIMUM AND 0.2010 INCHES MAXIMUM |
| HEAD STYLE | FLAT |
| III MATERIAL AND LOCATION | COBALT ALLOY SEAT FACE |
| III MATERIAL AND LOCATION | STEEL, FED STD 66, SAE HNV3 HEAD |
| III MATERIAL AND LOCATION | STEEL, FED STD 66, SAE HNV3 STEM |
| PROPRIETARY CHARACTERISTICS | PACS |
| METALLIC HARDNESS RATING AND LOCATION | 32.0 ROCKWELL C MINIMUM HEAD ERR-100 |
| METALLIC HARDNESS RATING AND LOCATION | 32.0 ROCKWELL C MINIMUM SEAT FACE ERR-100 |
| METALLIC HARDNESS RATING AND LOCATION | 32.0 ROCKWELL C MINIMUM STEM ERR-100 |
| METALLIC HARDNESS RATING AND LOCATION | 49.0 ROCKWELL C MINIMUM TIP ERR-100 |
| NECK RADIUS | 0.3440 INCHES NOMINAL |
| OUTSIDE DIAMETER | 1.4950 INCHES MINIMUM AND 1.5050 INCHES MAXIMUM |
| SEAT ANGLE IN DEG | 46.0 |
| SECOND GROOVE DIAMETER | 0.2970 INCHES MINIMUM AND 0.3030 INCHES MAXIMUM |
| SECOND GROOVE WIDTH | 0.1050 NOMINAL MILS AND 0.1150 NOMINAL CENTIMETERS |